/*
 Copyright (C) 2010 Kristian Duske

 This file is part of TrenchBroom.

 TrenchBroom is free software: you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation, either version 3 of the License, or
 (at your option) any later version.

 TrenchBroom is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License
 along with TrenchBroom. If not, see <http://www.gnu.org/licenses/>.
 */

#pragma once

#include <QLineEdit>
#include <QRegularExpression>

class QCompleter;

namespace tb::ui
{

class MultiCompletionLineEdit : public QLineEdit
{
private:
  QCompleter* m_multiCompleter = nullptr;
  QRegularExpression m_leftDelimiter;
  QRegularExpression m_rightDelimiter;

public:
  explicit MultiCompletionLineEdit(QWidget* parent = nullptr);
  explicit MultiCompletionLineEdit(const QString& contents, QWidget* parent = nullptr);
  ~MultiCompletionLineEdit() override;

public:
  void setWordDelimiter(const QRegularExpression& leftDelimiter);
  void setWordDelimiters(
    const QRegularExpression& leftDelimiter, const QRegularExpression& rightDelimiter);
  void setMultiCompleter(QCompleter* completer);

protected:
  void keyPressEvent(QKeyEvent* event) override;

private:
  void updateCompleter(bool showCompleter);

  int findLeftBoundary() const;
  int findRightBoundary() const;

  int findFirstMatch(const QString& str, const QRegularExpression& expression) const;
  int findLastMatch(const QString& str, const QRegularExpression& expression) const;
private slots:
  void triggerCompletion();
  void insertCompletion(const QString& string);
};

} // namespace tb::ui
